Tank flotation device



FIG. 1 is a perspective view of a tank flotation device in accordance with the present design;

FIG. 2 is an alternative perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof. 

CLAIM The ornamental design for a tank flotation device, as shown and described. 